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METHOD STATEMENT FOR PLASTER WORK

Er. Parbhakar Dwivedi
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Reference

The following reference shall be used in conjunction with this procedure

  • Technical Specifications
  • IS Codes : IS 1077
  • Drawings
  • BOQ

Resources Used

A. Manpower

  • Skilled Labour
  • Khalasi Gang
  • Unskilled Labour

B. Machinery

  • Mixer Machines
  • Toothing and Racking Tools
  • Wooden straight edge, masonic spirit levels, square,1m rule line
  • Plumb

Safety Points

  • While doing job at height, person must anchor his safety belt with "LIFELINE"
  • Provide safety cages around moving motors

Work Procedure

Scaffolding

  • For all exposed brick work or tile work double scaffolding independent of the work having two sets of vertical supports shall be provided. The supports shall be sound and strong, tied together with horizontal pieces over which scaffolding planks shall be fixed.
  • For all other work in buildings, single scaffolding shall be permitted. In such cases the inner end of the horizontal scaffolding pole shall rest in a hole provided only in the header course for the purpose. Only one header for each pole shall be left out. Such holes for scaffolding shall, however, not be allowed in pillars/columns less than one meter in width or immediately near the skew backs of arches. The holes left in masonry works for scaffolding purposes shall be filled and made good before plastering

Preparation of Surface

  • The joints shall be raked out properly. Dust and loose mortar shall be brushed out. Efflorescence if any shall be removed by brushing and scrapping. The surface shall then be thoroughly washed with water, cleaned and kept wet before plastering is commenced. In case of concrete surface if a chemical retarder has been applied to the form work, the surface shall be roughened by wire brushing and all the resulting dust and loose particles cleaned off and care shall be taken that none of the retarders is left on the surface.

Mortar

  • Mortar for plastering shall be as specified in technical specification.
  • Cement and sand shall be thoroughly mixed dry in a mechanical mixer and water shall then be added to obtain a mortar of a workable consistency. Hand mixing may be allowed by the Engineer on clean approved platform in special cases only.
  • Ceiling plaster shall be completed before commencement of wall plaster.

Application of Plaster (12mm, 15mm - Internal Plaster)

  • Plastering shall be started from the top and worked down towards the floor. All putlog holes shall be properly filled in advance of the plastering as the scaffolding is being taken down.
  • To ensure even thickness and a true surface, plaster about 15 × 15 cm shall be first applied, horizontally and vertically, at not more than 2 meters intervals over the entire surface to serve as gauges. The surfaces of these gauged areas shall be truly in the plane of the finished plaster surface.
  • The mortar shall then be laid on the wall, between the gauges with trowel. The mortar shall be applied in a uniform surface slightly more than the specified thickness. This shall be brought to a true surface, by working a wooden straight edge reaching across the gauges, with small upward and sideways movements at a time.
  • Finally the surface shall be finished off true with trowel or wooden float according as a smooth or a sandy granular texture is required. Excessive troweling or over working the float shall be avoided.
  • All corners, arises, angles and junctions shall be truly vertical or horizontal as the case may be and shall be carefully finished. Rounding or chamfering corners, arises, provision of grooves at junctions etc. where required shall be done without any extra payment. Such rounding, chamfering or grooving shall be carried out with proper templates or battens to the sizes required.
  • When suspending work at the end of the day, the plaster shall be left, cut clean to line both horizontally and vertically. When recommencing the plastering, the edge of the old work shall be Scrapped cleaned and wetted with cement slurry before plaster is applied to the adjacent areas, to enable the two to properly join together. Plastering work shall be closed at the end of the day on the body of wall and not nearer than 15 cm to any corners or arises. It shall not be closed on the body of the features such as plasters, bands and cornices, nor at the corners of arises.

18mm Cement Plaster (Two Coat Work-External Plaster)

Mortar

  • The mix and type of fine aggregate specified in the description of the item shall be used for the respective coats. Generally coarse sand shall be used for the under coat and fine sand for the finishing coat

Application

  • The plaster shall be applied in two coats i.e. 12 mm under coat and then 6 mm finishing coat and shall have an average total thickness of not less than 18 mm. 12 mm Under Coat: This shall be applied as specified except that when the plaster has been brought to a true surface a wooden straight edge and the surface shall be left rough and furrowed 2 mm deep with a scratching tool diagonally both ways, to form key for the finishing coat. The Surface shall be kept wet till the finishing coat is applied. 6 mm Finishing Coat: The finishing coat shall be applied after the under coat has sufficiently set but not dried and in any case within 48 hours.

6 mm cement plaster on Reinforced Concrete work (ceiling Work)

Preparation of Surface

  • Projecting burrs of mortar formed due to the gaps at joints in shuttering shall be removed. The surface shall be scrubbed clean with wire brushes. In addition concrete surfaces to be plastered shall be pock marked with a pointed tool, at spacing’s of not more than 5 cm, the pock being made not less than 3 mm deep. This is to ensure a proper key for the plaster. The mortar shall be washed off and surface, cleaned off all oil, grease etc. and well wetted before the plaster is applied.

Application

  • To ensure even thickness and a true surface, gauges of plaster 15 x 15 cm. shall be first applied at not more than 1.5 m intervals in both directions to serve as guides for the plastering. Surface of these gauged areas shall be truly in the plane of the finished plaster surface. The plaster shall be then applied in a uniform surface to a thickness slightly more than the specified thickness and shall then be brought to true and even surface by working a wooden straight edge reaching across the gauges. Finally the surface shall be finished true with a trowel or with wooden float to give a smooth or sandy granular texture as required. Excess troweling or over working of the floats shall be avoided.

Thickness

  • The average thickness of plaster shall not be less than 6 mm. The minimum thickness over any portion of the surface shall not be less than 5 mm.

Curing

  • The plaster shall be kept wet for a period of at least 7 days. During this period, it shall be suitably protected from all damages. The dates on which the plastering is done shall be legibly marked on the various sections.

Precaution

Any cracks which appear in the surface and all portions which sound hollow when tapped, or are found to be soft or otherwise defective, shall be cut out in rectangular shape and redone as directed by the Engineer-in-Charge.

  • i) When ceiling plaster is done, it shall be finished to chamfered edge at an angle at its junction with a suitable tool when plaster is being done.
  • ii) To prevent surface cracks appearing between junctions of column/beam and walls, 150 mm wide Chicken wire mesh should be fixed with U nails 150 mm centre to centre before plastering the Junction. The plastering of walls and beam/column in one vertical plane should be carried out in One go.

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